The homegrown urban artist's newly-issued Jive/Columbia single Champion, which features Chris Brown, has opened up a lead of around 6,000 sales over Price Tag by Jessie J featuring BoB, according to OCC data. J's Island/Lava single debuted at number one last Sunday having become part of the so-called on air/on sale revolution in which tracks are released commercially almost as soon as radio stations start playing them.
Both Jessie J and Chris Brown could end up having two singles in this coming Sunday's new chart, with Price Tag's predecessor Do It Like A Dude the 10th biggest seller for the week so far, while Brown's RCA offering Yeah 3X is ranked seventh having sat in ninth place on last Sunday's chart.
Three places outside the Top 10 positions at present, Def Jam/Mercury act Rihanna's S&M is enjoying a 280% week-on-week uplift in sales after making it to 20th place on last Sunday's chart.
Cash Money/Island release Moment 4 Life by Nicki Minaj featuring Drake is also experiencing a significant uplift in sales, with its 155% lift likely to move it into the Top 40 this coming Sunday.
Below Chipmunk, there are no other brand new entries in the Top 20 at present, although several are lining up a few places below. They are led by RCA's Stuttering by Loick Essien featuring N-Dubz and also include singles by AEI/AATW's Modestep, 360's Lethal Bizzle (featuring Grime All) and Ministry of Sound's Eric Prydz.
XL act Adele has now surpassed 350,000 UK sales of her second album 21, which on its third week of release is currently outselling its three closest rivals combined. Nearest to it is Elektra/Atlantic act Bruno Mars' Doo-Wops & Hooligans, while Mercury's Chase & Status are ranked third with No More Idols.
The first of the five leading artists on the BBC Sound of 2011 poll to have his debut album released is looking likely to land an instant Top 10 album this weekend. Runner-up to Jessie J on the poll, A&M/Atlas's James Blake has the sixth best-selling album of the week so far with his self-titled debut, which is just a few sales behind 679/Atlantic act The Streets' brand new album Computers And Blues in fifth place. Def Jam/Mercury's Rihanna is fourth with Loud.
The Glee Cast are heading for their eighth UK Top 40 album in just 12 months with the Epic-released The Rocky Horror Glee Show currently showing as a new entry at 13. Other acts expected to land new albums in the Top 40 include Verve Forecast/Decca's Teddy Thompson and Absentee Recordings' Boxer Rebellion.
Meanwhile, in the days leading up to Valentine's Day, a number of love-themed albums are picking up the sales pace, including the Rhino-issued Love Songs by Roberta Flack (up 46% on the week) and a UB40 Virgin album also called Love Songs (up 527%). On compilations five of the week's seven top sellers so far have love themes, led by the All Around The World/EMI TV/UMTV set Love 2 Club 2011 at number one.
The full midweeks singles and albums charts are on musicweek.com